No. 60011, Issue 8. October 1998
5 Installation
13
5.3.4
12VLM Connection to the Battery
The 12VLM has its power
supplied directly from the
battery and not through the
DXBUS. This is a
necessary requirement for
TÜV compliance.
The 12VLM can also be
power from the DXBUS-
and DXBUS+ outputs on
the 21 way connector if
TÜV compliance is not
required.
Note :
Heavy lines denote 3 mm² wire. All other wires from the 21 way connector
as specified.
5.3.5
Battery Type
The DX System is designed to perform optimally with either Lead-Acid or Gel Cell
24 V deep cycle batteries, rated at 20 - 120 Amp hours. The maximum average
discharge rate must not exceed half the rated capacity, in Amp hours.
High continuous discharge rates dramatically reduces the available battery capacity.
For example, at a discharge rate equal to the rated capacity, the available capacity
it 50 - 60 %. At a discharge rate of half the rated capacity, the available capacity is
70 - 80 %.
A wheelchair that draws maximum average battery current of 20 A, requires a
battery of at least 40 Amp hours. A battery of only 20 Amp-hours, would begin to
suffer a drop in performance at about half of its available capacity. The 40 Amp
hour battery has a full performance range of 4.5 greater than the 20 Amp hour
battery; a 80 Amp hour battery would only increase this range by 2.5 when
compared to a 40 Amp hour battery.